Hydraulic machinery



No. 6|7,9|3. Patented Jan. 1], I899. R. H. STEVENS.

HYDRAULIC MACHINERY (Application filed Oct. 18, 1898.)

(No Model.)

WI'I'N ESS ES INVENTOR WM W UNITED STATES PATENT OFFICE.

RICHARD HARRY STEVENS, OF BRADD OGK, PENNSYLVANIA.

HYDRA U LIC MACHINERY.

SPECIFICATION forming part of Letters ratent No. 617,913, dated January 17, 1899. Application filed October 18, 1898. Serial No. 693,862. (No model.)

To all whom it may concern:

Be it known that I, RICHARD HARRY STE- VENS, of Braddock, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Hydraulic Machinery, of which the following is a-full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification, which shows in elevation, partly in vertical section, hydraulic shears embodying my invention.

In the drawing, 2 represents the main cylinder of hydraulic shears, having the usual plunger 3 and cross-head 4.

5 is the moving knife-head of the machine, set in guides 6 and connected with the crosshead 4 by bolts or rods 7, which transmit to the moving head the motion of the plunger.

The cylinder 2 operates the moving head in the direction in which it does the work of shearin but I employ other single-acting cylinders which serve as pull-back cylinders to retract the plungers and to displace the water from the main cylinder. These pullback cylinders are on the machine-frame at 8.8,andthe bolts or rods 7 extend through them and serve as their plungers, having shoulders or enlarged portions 9 for that purpose. 10 10 are the water-inlets of these cylinders.

The novel feature of my invention is in the use j Of the connecting rods or bolts as the plungers of the pull-back cylinders, and I desire to cover the same whether the main cylinder be at the top of the machine with the moving knife-head below, as in the drawing, or whether these parts be reversed.

1. The combination with a main cylinder and moving head, of connecting bolts or rods, and pull-back cylinders to which the bolts or rods serve as plungers.

2. The combination with a main cylinder and moving head, of connecting bolts or rods,

and pull-back. cylinders through which the bolts or rods pass and to which they serve as plungers.

3. The combination with a main cylinder and movinghead, of a connecting rod or bolt and a pull-back cylinder to which the rod or bolt serves as a plunger.

In testimony whereof I have hereunto set my hand October 7, 1898.

RICHARD HARRY STEVENS.

Witnesses: THOMAS W. BAKEWELL, LENDELL A. OoNNER, Jr. 

